Bit bois d



4nivilnn STATES Parnu?,

DU BOIS D. PARMELEE, `0F SALEM, `MASSAGI-IUSETTS,` ASSIGNQR: J

OFBEVERLY, MASSACHUSET'IS.-`

MANUFACTUBE or INDIAmUBBER HoLLow Monpsnnlvrrcrns Specification ofLetters Patent No. 26,551, dated l To all whom it may concer/n: l i i Beit known that I, DU Bois D. Ramis-LEE, of Salem, in the countyofEsseXand State of Massachusetts, have invented a new and useful Methodor Process of Making Hol low Molded Articles from India-Rubber or itsCompounds; and I hereby declare the following to be a full and cleardescription thereof, Vreference being had to the accompanying drawing,making part of this specifrom the mold. I also, in the case the articlebeing spoiledin or turning out defective from the mold, and which isoften unavoidable, occasions serious loss of time, labor, `fuel andmaterial, as the article being vulcanized as it issues from themoldmakes the rubber comparatively of no value. In such process, heattoo is absolutely necessary alike to eifect the vulcanization of thegoods as to accomplish the molding of them, which is done by insertin abag of prepared rubber in the mold, a er the baglhas been closed withone or more drops of water placed inside it,`and

then subjecting the whole to the action of heat of a high temperature,which, while it perfects the vulcanization of the rubber, converts thewater inside the baginto steam or va or that presses out the bag againstthe si es of the mold and gives to the rub` ber the form and impressionof the mold.`

My present process for the manufacture of like articles dispenses withthe application of heat, either to effect the vulcaniza-` tion ormolding of the article. It also, by employing crude rubber incontradistinction to rubber prepared with sulfur as heretofore, admitsof the advantageous admixture with the rubber of various earthysubstances as reviously referred to; and in cases of deective moldingthe spoiled articles being of mmm maaolfaaa as valuable aseverfandsuitableto bezworkgd `over again, which is da `veryl.importantcon#` il sideration in manufacturingon alarge scalegs.

`Besides these, there are other"advantagesfor; 1^

this my presentdescribed1metlrod,but Iitfis 1" l l `unnecessary tospeak` of `themjhereuandl@ shall now proceed brieiiy to describe mynew aprocess. a y l I form a closed bag of `india rubber or its compoundsfree from admixturewithsullf fur as necessary undertheuGoodyear proc# ness of vulcanization. "Such bag maybe made y from sheets of rubber cutandjoined tofap-f proximate in rough `outline `the lgureydej-` .i a l,signed to be molded.` `Ithen placesaid bag v f in a divided mold ofthe.desiredfeinterior1 configuration, and properly` securing said moldstogether, putthemand the bag conf" tained within them under the receiverofanf air pump. `This done, Iexhaust thefairg from the receiverin orderSto produce` af partial or perfect vacuum, within the molds 1w y a orbetween the interior surface or surfaces L thereof and the outer surfaceofthe closed l bag, by the escape ofthe air from said in i terveningspace through the joints ofthe-"1 mold or through any suitable.openinglgleftf for the purpose. A vacuum thus established on theoutside of the lbag""and Sbetweenfit a l, and the molds causes the air]within the bag; l to eXp nd the latteryand "make` it `conform` to theinside configuration` ofthe mold fand i which shape the bag,I afterithas beenfsub jected .to such expansion forgthelnecessaryy interval oftime, will retaiin on its removal from the receiverand molds.` l l 3 Thetime of exposure to expansion will of l course vary with the thicknessof thelsheets` of which the bags are formed,jorpwthfthd` degree ofrarefacton produced betweenjtheH` .L molds and bag whenundernthereceiver, or,` as other circumstances may rendernecessary On removal oftherubber` figure fromthe molds, it may be `punctured to @admit air :offull atmospheric; pressure;` .or, air `offull. atmospheric pressurelmay`be made to freely; enter the bag whengbeingmolded..as. `de scribed by,inthe caseofzanlarticlebeing. manufactured requiring an` opening to beleft in ite-such as a"bottle-arranging,the molds, containing the bag,"inachest, wit the neck or open portion of thearticle fi freecommunication with the air on the outside of the chest, and then, bypumping the air from the interior of the chest, which may be of size toaccommodate a series of mo ds and be connected by pipe with an air pump.The article or articles thus molded, I afterward treat in the cold way,to effect the change by dipping them in any suitable hermizing solution.

The drawings accompanying this specification represent two sectionalViews of a mold with its clamps VYcontaining an india rubber syringebulb in a state of completion as manufactured by the process hereindescribed.

Having thus described my invention and the manner in which it is carriedinto eiect,

what I claim as my invention and desire to secure by Letters Patent is-Making hollow articles of India rubber or its equivalent or theircompounds, when the same are to be treated in the cold way, aftermolding, to effect the change as described, by shaping the atricles inmolds, from bags formed of such rubber, and exhausting the air frombetween said molds and the bags substantially as herein set'forth.

In testimony whereof I have signed my name to this specification beforetwo subscribing witnesses.

DU BOIS D. PARMELEE.

Witnesses:

A. POLLAK, EDW. F. BROWN.

